feat: add rate limiting and improve event handling

- Introduced rate limiting configuration in config.toml with options for enabling, requests per second (RPS), and burst capacity.
- Enhanced event handling in the OneBot11 adapter to ignore messages sent by the bot itself.
- Updated the dispatcher to register rate limit middleware based on configuration settings.
- Refactored WebSocket message handling to support flexible JSON parsing and improved event type detection.
- Removed deprecated echo plugin and associated tests to streamline the codebase.

internal/adapter/onebot11/adapter.go

@@ -206,6 +206,11 @@ func (a *Adapter) ParseMessage(raw []byte) (protocol.Event, error) {
 		return nil, fmt.Errorf("failed to unmarshal raw event: %w", err)
 	}
 
+	// 忽略机器人自己发送的消息
+	if rawEvent.PostType == "message_sent" {
+		return nil, fmt.Errorf("ignoring message_sent event")
+	}
+
 	return a.convertToEvent(&rawEvent)
 }
 
@@ -419,17 +424,24 @@ func (a *Adapter) handleWebSocketMessages() {
 			zap.Int("size", len(message)),
 			zap.String("preview", string(message[:min(len(message), 200)])))
 
-		// 尝试解析为响应
-		var resp OB11Response
-		if err := sonic.Unmarshal(message, &resp); err == nil {
-			// 如果有echo字段，说明是API响应
-			if resp.Echo != "" {
-				a.logger.Debug("Received API response",
-					zap.String("echo", resp.Echo),
-					zap.String("status", resp.Status),
-					zap.Int("retcode", resp.RetCode))
-				a.wsWaiter.Notify(&resp)
-				continue
+		// 尝试解析为响应（先检查是否有 echo 字段）
+		var tempMap map[string]interface{}
+		if err := sonic.Unmarshal(message, &tempMap); err == nil {
+			if echo, ok := tempMap["echo"].(string); ok && echo != "" {
+				// 有 echo 字段，说明是API响应
+				var resp OB11Response
+				if err := sonic.Unmarshal(message, &resp); err == nil {
+					a.logger.Debug("Received API response",
+						zap.String("echo", resp.Echo),
+						zap.String("status", resp.Status),
+						zap.Int("retcode", resp.RetCode))
+					a.wsWaiter.Notify(&resp)
+					continue
+				} else {
+					a.logger.Warn("Failed to parse API response",
+						zap.Error(err),
+						zap.String("echo", echo))
+				}
 			}
 		}
 
@@ -441,9 +453,14 @@ func (a *Adapter) handleWebSocketMessages() {
 		a.logger.Info("Parsing OneBot event...")
 		event, err := a.ParseMessage(message)
 		if err != nil {
-			a.logger.Error("Failed to parse event",
-				zap.Error(err),
-				zap.ByteString("raw_message", message))
+			// 如果是忽略的事件（如 message_sent），只记录 debug 日志
+			if err.Error() == "ignoring message_sent event" {
+				a.logger.Debug("Ignoring message_sent event")
+			} else {
+				a.logger.Error("Failed to parse event",
+					zap.Error(err),
+					zap.ByteString("raw_message", message))
+			}
 			continue
 		}